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Reliable Power for Your Devices! Enjoy consistent and dependable performance with the Sony SR521SW button cell battery. Designed for a wide range of small electronics, this battery delivers stable 1.55V output and is made from durable silver oxide, ensuring long-lasting use for your daily needs. Versatile Compatibility Experience convenience with a battery that fits many popular models, including SR521SW, AG0, 379, and others. Perfect for watches, calculators, car remote controls, toys, thermometers, and more. Pack Options to Suit Your Needs Choose from different pack sizes to match your requirements: - Model: SR521SR/379 Why Choose Sony SR521SW? - Reliable 1.55V silver oxide battery - Compatible with multiple device models - Suitable for watches, calculators, remotes, and more Select the pack size that best fits your usage and keep your devices powered up with confidence!